309 lines
9.0 KiB
C
309 lines
9.0 KiB
C
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/*++
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/* NAME
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/* smtp_trouble 3
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/* SUMMARY
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/* error handler policies
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/* SYNOPSIS
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/* #include "smtp.h"
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/*
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/* int smtp_site_fail(state, code, format, ...)
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/* SMTP_STATE *state;
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/* int code;
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/* char *format;
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/*
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/* int smtp_mesg_fail(state, code, format, ...)
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/* SMTP_STATE *state;
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/* int code;
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/* char *format;
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/*
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/* void smtp_rcpt_fail(state, code, recipient, format, ...)
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/* SMTP_STATE *state;
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/* int code;
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/* RECIPIENT *recipient;
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/* char *format;
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/*
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/* int smtp_stream_except(state, exception, description)
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/* SMTP_STATE *state;
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/* int exception;
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/* char *description;
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/* DESCRIPTION
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/* This module handles all non-fatal errors that can happen while
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/* attempting to deliver mail via SMTP, and implements the policy
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/* of how to deal with the error. Depending on the nature of
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/* the problem, delivery of a single message is deferred, delivery
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/* of all messages to the same domain is deferred, or one or more
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/* recipients are given up as non-deliverable and a bounce log is
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/* updated.
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/*
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/* In addition, when an unexpected response code is seen such
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/* as 3xx where only 4xx or 5xx are expected, or any error code
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/* that suggests a syntax error or something similar, the
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/* protocol error flag is set so that the postmaster receives
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/* a transcript of the session. No notification is generated for
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/* what appear to be configuration errors - very likely, they
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/* would suffer the same problem and just cause more trouble.
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/*
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/* smtp_site_fail() handles the case where the program fails to
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/* complete the initial SMTP handshake: the server is not reachable,
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/* is not running, does not want talk to us, or we talk to ourselves.
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/* The \fIcode\fR gives an error status code; the \fIformat\fR
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/* argument gives a textual description. The policy is: soft
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/* error: defer delivery of all messages to this domain; hard
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/* error: bounce all recipients of this message.
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/* The result is non-zero.
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/*
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/* smtp_mesg_fail() handles the case where the smtp server
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/* does not accept the sender address or the message data.
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/* The policy is: soft errors: defer delivery of this message;
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/* hard error: bounce all recipients of this message.
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/* The result is non-zero.
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/*
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/* smtp_rcpt_fail() handles the case where a recipient is not
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/* accepted by the server for reasons other than that the server
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/* recipient limit is reached. The policy is: soft error: defer
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/* delivery to this recipient; hard error: bounce this recipient.
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/*
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/* smtp_stream_except() handles the exceptions generated by
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/* the smtp_stream(3) module (i.e. timeouts and I/O errors).
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/* The \fIexception\fR argument specifies the type of problem.
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/* The \fIdescription\fR argument describes at what stage of
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/* the SMTP dialog the problem happened. The policy is to defer
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/* delivery of all messages to the same domain. The result is non-zero.
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/* DIAGNOSTICS
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/* Panic: unknown exception code.
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/* SEE ALSO
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/* smtp_proto(3) smtp high-level protocol
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/* smtp_stream(3) smtp low-level protocol
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/* defer(3) basic message defer interface
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/* bounce(3) basic message bounce interface
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include <sys_defs.h>
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#include <stdlib.h> /* 44BSD stdarg.h uses abort() */
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#include <setjmp.h>
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#include <stdarg.h>
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/* Utility library. */
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#include <msg.h>
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#include <vstring.h>
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#include <stringops.h>
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#include <mymalloc.h>
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/* Global library. */
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#include <smtp_stream.h>
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#include <deliver_request.h>
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#include <deliver_completed.h>
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#include <bounce.h>
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#include <defer.h>
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#include <mail_error.h>
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/* Application-specific. */
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#include "smtp.h"
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#define SMTP_SOFT(code) (((code) / 100) == 4)
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#define SMTP_HARD(code) (((code) / 100) == 5)
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#define KEEP BOUNCE_FLAG_KEEP
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/* smtp_check_code - check response code */
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static void smtp_check_code(SMTP_STATE *state, int code)
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{
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/*
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* The intention of this stuff is to alert the postmaster when the local
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* Postfix SMTP client screws up, protocol wise. RFC 821 says that x0z
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* replies "refer to syntax errors, syntactically correct commands that
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* don't fit any functional category, and unimplemented or superfluous
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* commands". Unfortunately, this also triggers postmaster notices when
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* remote servers screw up, protocol wise. This is becoming a common
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* problem now that response codes are configured manually as part of
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* anti-UCE systems, by people who aren't aware of RFC details.
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*/
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if ((!SMTP_SOFT(code) && !SMTP_HARD(code))
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|| code == 555 /* RFC 1869, section 6.1. */
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|| (code >= 500 && code < 510))
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state->error_mask |= MAIL_ERROR_PROTOCOL;
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}
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/* smtp_site_fail - defer site or bounce recipients */
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int smtp_site_fail(SMTP_STATE *state, int code, char *format,...)
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{
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DELIVER_REQUEST *request = state->request;
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SMTP_SESSION *session = state->session;
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RECIPIENT *rcpt;
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int status;
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int nrcpt;
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int soft_error = SMTP_SOFT(code);
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va_list ap;
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VSTRING *why = vstring_alloc(100);
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/*
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* Initialize.
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*/
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va_start(ap, format);
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vstring_vsprintf(why, format, ap);
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va_end(ap);
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/*
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* If this is a soft error, postpone further deliveries to this domain.
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* Otherwise, generate a bounce record for each recipient.
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*/
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for (nrcpt = 0; nrcpt < request->rcpt_list.len; nrcpt++) {
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rcpt = request->rcpt_list.info + nrcpt;
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if (rcpt->offset == 0)
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continue;
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status = (soft_error ? defer_append : bounce_append)
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(KEEP, request->queue_id, rcpt->address,
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session ? session->namaddr : "none",
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request->arrival_time, "%s", vstring_str(why));
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if (status == 0) {
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deliver_completed(state->src, rcpt->offset);
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rcpt->offset = 0;
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}
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state->status |= status;
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}
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if (soft_error && request->hop_status == 0)
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request->hop_status = mystrdup(vstring_str(why));
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/*
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* Cleanup.
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*/
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vstring_free(why);
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return (-1);
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}
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/* smtp_mesg_fail - defer message or bounce all recipients */
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int smtp_mesg_fail(SMTP_STATE *state, int code, char *format,...)
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{
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DELIVER_REQUEST *request = state->request;
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SMTP_SESSION *session = state->session;
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RECIPIENT *rcpt;
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int status;
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int nrcpt;
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va_list ap;
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VSTRING *why = vstring_alloc(100);
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/*
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* Initialize.
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*/
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va_start(ap, format);
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vstring_vsprintf(why, format, ap);
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va_end(ap);
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/*
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* If this is a soft error, postpone delivery of this message. Otherwise,
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* generate a bounce record for each recipient.
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*/
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for (nrcpt = 0; nrcpt < request->rcpt_list.len; nrcpt++) {
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rcpt = request->rcpt_list.info + nrcpt;
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if (rcpt->offset == 0)
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continue;
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status = (SMTP_SOFT(code) ? defer_append : bounce_append)
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(KEEP, request->queue_id, rcpt->address,
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session->namaddr, request->arrival_time,
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"%s", vstring_str(why));
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if (status == 0) {
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deliver_completed(state->src, rcpt->offset);
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rcpt->offset = 0;
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}
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state->status |= status;
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}
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smtp_check_code(state, code);
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/*
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* Cleanup.
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*/
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vstring_free(why);
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return (-1);
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}
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/* smtp_rcpt_fail - defer or bounce recipient */
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void smtp_rcpt_fail(SMTP_STATE *state, int code, RECIPIENT *rcpt,
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char *format,...)
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{
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DELIVER_REQUEST *request = state->request;
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SMTP_SESSION *session = state->session;
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int status;
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va_list ap;
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/*
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* If this is a soft error, postpone delivery to this recipient.
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* Otherwise, generate a bounce record for this recipient.
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*/
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va_start(ap, format);
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status = (SMTP_SOFT(code) ? vdefer_append : vbounce_append)
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(KEEP, request->queue_id, rcpt->address, session->namaddr,
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request->arrival_time, format, ap);
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va_end(ap);
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if (status == 0) {
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deliver_completed(state->src, rcpt->offset);
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rcpt->offset = 0;
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}
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smtp_check_code(state, code);
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state->status |= status;
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}
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/* smtp_stream_except - defer domain after I/O problem */
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int smtp_stream_except(SMTP_STATE *state, int code, char *description)
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{
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DELIVER_REQUEST *request = state->request;
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SMTP_SESSION *session = state->session;
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RECIPIENT *rcpt;
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int nrcpt;
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VSTRING *why = vstring_alloc(100);
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/*
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* Initialize.
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*/
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switch (code) {
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default:
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msg_panic("smtp_stream_except: unknown exception %d", code);
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case SMTP_ERR_EOF:
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vstring_sprintf(why, "lost connection with %s while %s",
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session->namaddr, description);
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break;
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case SMTP_ERR_TIME:
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vstring_sprintf(why, "conversation with %s timed out while %s",
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session->namaddr, description);
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break;
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}
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/*
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* At this point, the status of individual recipients remains unresolved.
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* All we know is that we should stay away from this host for a while.
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*/
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for (nrcpt = 0; nrcpt < request->rcpt_list.len; nrcpt++) {
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rcpt = request->rcpt_list.info + nrcpt;
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if (rcpt->offset == 0)
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continue;
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state->status |= defer_append(KEEP, request->queue_id,
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rcpt->address, session->namaddr,
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request->arrival_time,
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"%s", vstring_str(why));
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}
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/*
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* Cleanup.
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*/
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vstring_free(why);
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return (-1);
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}
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